Studies on Machining Characteristics & Optimal Process Parameters in Wire EDM of AL 6082 HNMMCS

Hybrid Nano Metal Matrix Composite (HNMMCs) are the newly developed material which are gaining increasing attention for applications in aerospace, defense and automobile industries as a light weight, high strength materials. In this present work by reinforcing the varying percentage of (0.3% GNT, 0.4% CNT) and (0.5% GNT, 0.6% CNT) the HNMMCs samples have been prepared using stir casting process. Experimental studies are conducted on HNMMCs samples to determine the Density, Hardness and Electrical conductivity. For measuring the hardness using Brinell hardness tester and for electrical conductivity using four probe technique. Machining of any hybrid nano composite materials by conventional machining method is difficult because drastic enhancement in particular properties of composite. WEDM independent of mechanical properties. That's why use of non-conventional machining techniques in shaping of hybrid aluminum metal matrix nano composites has generated considerable interest as the manufacturing of complicated contours such as dies. Machining experiments are conducted on HNMMCs according to Taguchi experimental design (L₁₈) for different parameter combinations such as (T_ON, T_OFF, Wire Feed and Gap Voltage). The experimental responses such as Material removal rate, Surface roughness, Machine Time and kerf width are measured and also the influence of machining parameters like Pulse on time (T_ON), Pulse off time (T_OFF), Wire feed (WF) and Gap Voltage on metal removal rate (MRR), surface roughness (SR), Machine Time and Kerf width is studied and the machining responses are analyzed using AHP-TOPSIS method. The optimal processes parameters are identified by using AHP-TOPSIS.